JPS62152510A - Apparatus for filtering liquid - Google Patents

Abstract

PURPOSE:To smoothly perform regeneration operation, by providing the filter discs fixed to and supported by a support shaft and a cleaner blade supported by said shaft in a loosely engaged state and contacted with the specific position of a stopper. CONSTITUTION:The liquid to be filtered introduced into a container 3 through an introducing port 1 passes through the gaps formed between opposed filter disks 9 to flow in a filter cartridge 6 and subsequently discharged out of the container 3 as a filtrate from a lead-out port 2. When a solid is adhered to the outer periphery of the cartridge 6, a support shaft 8 is rotated. Whereupon, as against that the discs 9 continuously rotate in a state fixed to and supported by a support shaft 8, cleaner blades 10 are contacted with a stopper 13 and the resolution thereof is stopped while the scraping action due to the blades 10 begins with the stoppage of revolution and the above-mentioned adhered solid is scraped off. At this time, because two mutually opposed blades 10 stop at mutually shifted positions, the solid is easy to fall and the accumulation thereof on each blade 10 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid filtration device, and more particularly to a device for filtering liquids such as seawater, river water, industrial wastewater, and chemical solutions.

A wide variety of conventional liquid filtration devices are known, but one that can regenerate the filtration function without stopping the filtration operation is, for example, disclosed in Japanese Patent Application Laid-Open No. 59-951.
There is something like the one described in No. 93.

This conventional device includes a container having an inlet for a liquid to be filtered and an outlet for a filtrate, and a filter cartridge housed in the container, and the filter cartridge includes:
A plurality of filter disks and spacers having a smaller diameter than the filter disks are fitted in layers alternately to a rotatably provided support shaft, and on the other hand, a plurality of filter disks and spacers having a smaller diameter than the filter disks are fitted on the sides of the filter car 1 to the ridge. A cleaner blade is fixedly supported on a fixed shaft, and the cleaner blade is made to protrude between opposing filter disks.

This device takes the liquid to be filtered introduced into the container from the inlet into the filter cartridge, guides it to the outlet through the liquid passage formed therein, and discharges it, but the solids contained in the liquid to be filtered are Depending on the gap between the opposing filter disks and the spacer, there are two types: those that do not pass through the gap but adhere to the outer periphery of the filter cartridge and are blocked, and those that flow into the filter cartridge through the gap. In other words, a filtration operation is performed. At this time, the filtration capacity decreases as solid matter adheres to the outer periphery of the filter cartridge, but when the support shaft of the filter cartridge is rotated, the filter disk fixed to it rotates, but the cleaner blade remains fixed. Since it is fixed to the shaft and does not rotate, a scraping action by the cleaner blade is obtained, and the adhering solid matter is scraped off by the scraping action, thereby regenerating the filtration function.

However, such conventional devices suffer from problems as discussed below.

That is, in the conventional device described above, since the cleaner blade is fixedly supported on a fixed shaft, the scraped solids do not fall easily even when the solids are sticky. It starts to build up on the cleaner blade. However, this solid deposit gradually grows and
Eventually, it will also cover the outer periphery of the filter cartridge.

If this happens, the filtration capacity will be greatly reduced. In addition, solid matter becomes more likely to be caught between the two opposing filter disks or between the filter disk and the spacer.

If a solid object is caught, an abnormally large force is applied to the filter disk, etc., and depending on the material and type of solid object, this may even lead to damage.

Problems to be Solved by the Invention The object of the invention is to solve the above-mentioned drawbacks of the conventional devices and to provide a filter disc which can prevent solids from accumulating on the cleaner blade during regeneration of the filtering function. It is an object of the present invention to provide a filtration device that can prevent an abnormally large force from being applied to, etc., and can perform regeneration operations extremely smoothly.

Means for Solving the Problems In order to achieve the above object, the present invention provides a container having at least an inlet for a liquid to be filtered and an outlet for a filtrate, and a filter car housed in the container. The filter cartridge has a plurality of filter disks and a cleaner blade having a circumscribed circle larger than the filter disks, which are fitted in layers alternately to a rotatably provided support shaft. The filter disk is fixedly supported on the support shaft, the cleaner blade is loosely fitted and supported on the support shaft, and a collar is provided on the side of the filter cartridge, with which the cleaner blade comes into contact; Also, the cleaner blade and the stopper are configured so that the two cleaner blades (the father's cleaner blade) come into contact with the stopper at positions shifted from each other when the two cleaner blades are opposed to each other. A liquid filtration device is provided.

The liquid to be filtered introduced into the container through the working inlet flows into the filter car 1 to ridge through the gap formed between the opposing filter disks, and passes through the liquid passage formed in the filter cartridge. The filtrate is discharged from the outlet to the outside of the container. At this time, depending on the size of the gap between the filter discs, the solids contained in the liquid to be filtered may adhere to and be blocked on the outer periphery of the filter cartridge without passing through the gap, or may pass through the gap. It is divided into filter car 1 to that which flows into the ridge. In other words, a filtration operation is performed.

On the other hand, if solid matter adheres to the outer periphery of the filter cartridge, the filtration ability will decrease, so the support shaft of the filter cartridge must be rotated. However, this support shaft may be kept rotating all the time. Then, both the filter disc and the cleaner blade rotate, but while the filter disc is fixedly supported by the support shaft and continues to rotate,
Since the cleaner blade is supported by a loose fit on the support shaft, it will eventually come into contact with the swivel and its rotation will be stopped. Along with this, the cleaner blade will begin its scraping action to remove the adhered solids. is scraped off. At this time, the two cleaner blades facing each other are
Since their side edges stop in a misaligned or offset position, solids tend to fall off and are prevented from accumulating on the cleaner blade.

EXAMPLE Next, the present invention will be explained in more detail based on one example.

In FIG. 1, the filtration device has a container 3 having a filtered liquid inlet 1 and a filtrate outlet 2 at the upper part. A solids outlet 5 with a valve 4 is provided at the bottom of the container 3 . Further, a filter cartridge 6 is housed in the container 3. The filter cars 1 to 6 have a plurality of filter disks 9 and a cleaner blade 10 having a larger circumscribed circle alternately attached to a support lN13 driven by a motor 7 attached to the upper part of the container 3. They are fitted in layers and tightened with a nut 11. The bottom of the filter cartridge 6 is closed with a blind flange 12. Further, inside the container 3, a rod-shaped stopper 13 is provided on the side of the filter cartridge 6, with which the cleaner plate 10 comes into contact.

Referring to FIG. 2, the filter disk 9 has a disk shape with a uniform thickness when viewed as a whole, and has a boss 14, a ring 15, and connects the boss 14 and the ring 15. It has a plurality of arms 16, and a liquid passage 17 is formed between adjacent arms. Therefore, when looking at the two opposing filter disks 9,
In this example, the arms 16 are shifted by 45 degrees from each other so that the positions of the arms 16 do not match. However,
In this invention, the filter disk 9 may be arranged so that the arm 16 is in the same position.

Further, the stopper 13 has small diameter parts and large diameter parts alternately, and when looking at the two cleaner blades facing each other, one cleaner blade is located in the small diameter part and the other cleaner blade is located in the large diameter part. , are arranged so that they are in contact with each other. Note that the filter disk 9 is attached to the support shaft 8.
It is fixedly supported. Further, it is preferable that the thickness of the cleaner blade 10 is at least twice that of the cleaner blade 10.

The cleaner blade 10 is fitted onto the support shaft 8 via a spacer 18 that is slightly thicker than the spacer 18, but is not fixed to the support shaft 8 and is supported by a loose fit. The spacer 18 accurately regulates the gap between the filter disks 9 facing each other.

To explain the operation of the above-mentioned device, from the inlet 1 to the container 3
When the liquid to be filtered is continuously supplied into the filter cartridge 6, the liquid to be filtered is taken into the filter cartridge 6, passes through the liquid passage 17 of the filter disk, reaches the outlet 2, and is discharged to the outside of the container 3 as a filtrate. . At this time, the solids in the liquid to be filtered are removed from the filter disks 9 facing each other.
Depending on the size of the gap, there are those that do not pass through the gap and are attached to the outer periphery of the filter cartridge 6 and are blocked;
It is divided into two parts: one that passes through the gap and is discharged from the outlet 2. In other words, it is filtered.

Of course, some solid matter does not adhere to the outer periphery of the filter cartridge 6 but instead settles on the bottom of the container 3 as it is.

At this time, the motor 7 is operated constantly or as needed. Then, the support shafts 8 of the filter cars 1 to 6
The filter disk 9 fixedly supported on rotates, and the cleaner blade 10 also rotates at the same time. However, while the filter disk 9 that is fixedly supported by the support shaft 8 continues to rotate, the cleaner blade 10 that is loosely supported eventually comes into contact with the blades 1 to 13 and stops rotating. At this time, since the blades 1 to 13 have small diameter parts and large diameter parts alternately, the two cleaner blades facing each other, as shown in FIG.
Their side edges do not coincide, but stop at offset positions from each other. In other words, in the direction of rotation shown by the arrow,
The cleaner blade that abuts the small diameter portion of the stopper 3 is shifted forward, and the cleaner blade that abuts the large diameter portion is shifted slightly rearward and stopped. Along with this, the scraping action by the cleaner blade 10 begins, and the solid matter adhering to the outer periphery of the filter cartridge 6 is scraped off into the container 3. After continuing the operation for a desired time, the support shaft 8 is now rotated in the opposite direction. Then, the filter disk 9 rotates and at the same time the cleaner blade 10
It also rotates. As described above, the cleaner blade 10 eventually comes into contact with the stopper 13 and stops rotating, but this time the front and back relationship is reversed, and what was at the front is now at the rear when viewed from the initial direction of rotation. Each object will stop in front of it. Therefore, in this case as well, the side edges of the two cleaner blades facing each other are not damaged at all but are shifted. The solids scraped off by this operation are discharged from the container 3 through the solids discharge port 5 by opening the valve 4 as necessary. Of course, the solid matter that did not adhere to the outer periphery of the filter cartridge 6 but was deposited at the bottom of the container 3 is also discharged at the same time.

In the embodiment described above, the valve 4 and the solid matter discharge port 5 are not necessarily necessary, and the container may be opened as appropriate to take out the solid matter.

Furthermore, in the above description, the case where a stepped stopper is used to shift the stop position of the cleaner blade has been described, but similarly, as shown in FIG. This can also be achieved by using a leaner blade 10, which has the tip of the cleaner blade shown in FIG. 2 cut away.

In this case, the directions of adjacent cleaner blades are reversed.

Effects of the Invention This invention is configured such that the cleaner blade is rotatably provided, and when two cleaner blades facing each other are viewed, they come into contact with the stopper and stop at positions shifted from each other. This makes it possible to reliably scrape off solid matter, that is, regenerate the filtration function, and also prevent solid matter from adhering to or accumulating on the outer periphery of the cleaner blade or filter disk. . The effect of scraping off solid matter is further enhanced by the fact that the cleaner blades are loosely supported on the support shaft and rotate with the rotation of the filter disk, and all the cleaner blades do not necessarily overlap and rotate. improves. Further, if the direction of rotation of the cleaner blade is reversed as appropriate, the improvement can be improved considerably.

In addition, since solid matter is reliably scraped off and can be prevented from being caught between opposing filter disks or between the filter disk and the cleaner blade, it is possible to avoid cases where abnormally large forces are applied to the filter disks, etc. Not at all. This is further improved when the filter disks are arranged so that their arms do not match when two filter disks are opposed to each other. This means that it is possible to prevent deformation or damage to the filter disk or cleaner blade, producing the effects described below.

In other words, in conventional devices, the filter disks and cleaner blades must be made of metal because of the need to withstand the above-mentioned large forces, which not only increases the weight of the device but also has poor corrosion resistance. There is a problem that using high-quality metals increases equipment costs, but if the applied force can be reduced as described above, filter disks, cleaner blades, and even spacers can be made using materials such as alumina, zirconia, and silicon nitride. Although they are more brittle than metals, they can be made of materials such as ceramics and various plastics that are lightweight and highly corrosion resistant. Therefore, it becomes possible to reduce the weight and cost, and the durability of the device is greatly improved.

Improved durability against corrosion also means a wider range of applications.

When the filter disk, cleaner blade, etc. are made of ceramics, it is preferable to use zirconia ceramics, which have high toughness and excellent wear resistance. In particular, it is made of zirconia with a tetragonal crystal structure (tetragonal zirconia), or contains at least 50 mol%, preferably 70 mol% or more of tetragonal zirconia, and has a monoclinic crystal structure. It is preferable to use a zirconia sintered body that does not substantially contain zirconia (monoclinic zirconia). Since these so-called tetragonal zirconia ceramics exhibit stress-induced transformation, they have high mechanical strength, particularly toughness, and excellent wear resistance. Further, when the filter is applied to a high-temperature liquid to be filtered, it is preferable to use zirconia ceramics containing zirconia having a cubic crystal structure (cubic zirconia) in addition to tetragonal zirconia. That is, since cubic zirconia has the best thermal stability among zirconias, there is little deterioration in mechanical properties and wear resistance even at high temperatures.

[Brief explanation of drawings]

Fig. 1 is a schematic partially sectional front view showing one embodiment of the device of the present invention, Fig. 2 is a schematic perspective view showing an exploded filter cartridge, and Fig. 3 is a state in which the filter cartridge is brought into contact with the sill and collar. FIG. 4 is a schematic plan view showing the stopped state of the cleaner blade when the cleaner blade and stopper are different from those shown in FIGS. 1 to 3 above.
FIG. 6 is a schematic plan view showing the stopped state of the cleaner blade when it comes into contact with the collar. 1: Filtered liquid inlet 2: Filtrate outlet 3 2 containers 4: Valve 5: Solid matter outlet 6: Filter cartridge 7: Motor 8: Support shaft 9: Filter disk 10: Cleaner blade 11: Nut 12: Obstruction Flange 13: Stopper 14: Post 15: Ring 16: Arm 17: Liquid passage 18 Varnish spacer

Claims (1)

[Claims] It has a container having at least an inlet for a liquid to be filtered and an outlet for a filtrate, and a filter cartridge housed in the container, and the filter cartridge has a plurality of sheets attached to a rotatably provided support shaft. Filter disks and cleaner blades having a circumscribed circle larger than the filter disks are fitted in layers alternately, the filter disks are fixedly supported on the support shaft, and the cleaner blades are loosely fitted on the support shaft. A stopper is provided on the side of the filter cartridge, with which the cleaner blade abuts, and the cleaner blade and the stopper are arranged so that when two cleaner blades facing each other are viewed, the two cleaner blades are in contact with each other. A liquid filtration device characterized in that the device is configured to abut the stopper at a shifted position.